I've bought AT2 and Time Capsule. I've jailbreak AT2 and install XBMC. If i try to strem a 1080p film from my PC(windows 7) i don't have any problem but if i try to stream a same film from time capsule it are every 30 second in buffering.
If i play a film on my pc from tc have any problem. I Can't understand what is the problem.

Have to agree with Ned. I tried all sorts of combinations with atv2. Time Capsule was almost at the bottom of the list as far as performance goes. It might still work depending upon a host of other things, network, drive, connection, codec etc... Generally speaking though, you may struggle especially with high bitrate streams and the codecs requiring more processing.

Seems like windows, linux and osx have this enabled by default, and iOS doesn't? (At work, not confirmed). It may not be set due to compability issues with some devices - if I know Apple right, it is better to be safe than sorry.

Read elsewhere that people with lin/osx had 5-6 times performance gain on AFP file transfer by playing with these values.

as i'm now playing around with this, I just noticed the default maximum Segment Size is only 512 (probably done for wifi ??) however if you run a wired setup this is a bit low, as with ethernet you can use frame sizes of 1500 (minus TCP overhead) so this can be increased to 1440

so

Code:

sysctl -w net.inet.tcp.mssdflt=1440

Might give some more wired network speed, again this is only doing the setting live, you will loose it on reboot, for permanent, put it in /etc/sysctl.conf